This add-on allows you to rewrite arbitrarily whatever is entered in the location bar. It can be used to create URL shortcuts, similar to bookmark keywords, but more flexible, and to rewrite URI used by other tools into something that Firefox understands. For example, users of Launchpad may want to use the following rules
which will allow copy-pasting bzr branch URIs and launchpad bug identifiers directly into FIrefox. And MariaDB developers could use, say
^bzr\+ssh://bazaar.launchpad.net/ => http://code.launchpad.net/
^lp:(\d+)$ => https://bugs.launchpad.net/bugs/$1
^lp: => http://code.launchpad.net/
and conveniently copy-paste bug and worklog task references (that are in the form of WL#123) into Firefox.
^wl#(\d+)$ => http://askmonty.org/worklog/?tid=$1
^bug#(\d+)$ => http://bugs.mysql.com/bug.php?id=$1